Outboard-motor installation



May 29, 1928. 1,671,387

E. W. TROTMAN OUTBO ARD MOTOR INSTALLATION Filed Nov. 15, 1327 5Sheets$heet l E. W. TROTMAN OUTBOARD MQTQR INSTALLATION May 29, 1928.

3 Sheets-Sheet 2 Filed Nov. 15, 1927 May 29, 1928. 1,671,387

E. W. TROTMAN OUTBOARD MOTOR INSTALLATION FiledNov. 15, 1927 3Sheets-Sheet 5 Patented May 29, 1928.

- .UmTEmjsTAr-Es 4 1,671,381 PA rl-zur OFFICE. 7

nnwaan WILLIAM rnornmn, or wonvnnnmrron, ENGLAND.

ournoaan moron ms'ranmrr'ou.

Application filed November 15, 1927, Serial No. 238,884, and in GreatBritain November 27,.1'1986. I 1 a- This invention relates to outboardmotor installations, of the kind in which the power portion has avertically arranged crankshaft (or substantially so) with one or morecylinders radial thereto and constitutes a unit which is detachablyconnected with another unit beneath it for attachment to a boat andsupporting the transmission shaft and propeller. I I

It has previously been proposed to provide on the lower unit arms havingat their ends hinged clamping bows adapted to gri around the outer endsof the respective cy inders. Alignment of the two units was ensured bythe bearing boss forthe crankshaft are connected by fasteners, eachcomprising a number of parts, of which one is fixed to one unit and, ineffecting the locking, is

adapted by a vertical movement to enter another part of the fastenerwhich is attached to the other unit.

In the accompanying drawings, showing various methods of carrying outthe invention: a A

Fi re 1 is an outline elevation of the comp ete motor, omitting allunnecessary parts,

Figures 2-8, to a larger scale than the foregoing, are fragmentary viewsshowing various methods of connecting the power portion of the motorwith the lower unit bydwhich attachment is made to the boat, an I Figure9 is a fragmenta'ry'axial section to 46 a still larger scale showing notonly an attachment means betweenthe two parts of the motor but also themeans for simultaneously connecting or disconnecting the water-coolingsupply.

In Figure 1, which illustrates anengine having twin opposed cylindersactuating a- 65. 3, the flywheel at 4, and a fuel tank at 5 According tothis invention, the two units Y arranged above the cylinders andsurroundmg the flywheel. The means by which the motor is secured to thestern of the boat-is constituted by a pair of brackets 6 arranged one oneach sideof the casing 7 surrounding the engine shaft; (not shown).These brackets are of inverted U-form. adapted to engage the transom orequivalent part of the boat, the inner limbs 8 of the brackets beingshorter than the outer ones and carrying clampin screws engaging the'holes 9 to effect the xi'ng of the .motor to the boat. 7

By the present invention the power portion or unit comprising the engineand its associated parts including the fuel tank are disconnectible fromthe bracket and the parts carried by the latter, including the propellerand transmission gear,.the bracket with these parts being hereundertermed the lowerunit. The various methods b which the connection is madebetween t e two parts of the motor are illustrated in Figures 2-8 andconstitute further features of the invention.

The casing 7 depends from, and, to provide for steering by swivellin thepropeller,- is angularly free in a plat orm 10 which may be of thegeneral form shown in Figures 2, 4, 7 and 8, or as in Figures 1 and 9.This platform is provided with a pivotal connection (not'shown) with theupper ends of the brackets 6, so that the motor can tilt fore and aft inthe known'manner.

On its upper side is a hollow neck 11 I having a flange 12, and upon thelatter rests an annular web 13 on the underside of the a crankcase 2.From this web depend pins 14 which extend through holes in the flange 12and also into holes in the'platform 10. A tubular boss 15 on thecrankcase 2 enters the hollow neck 11' forminga spigotal'register betwenthe power and lower units.

The pins 141f01111 quick attachment means for the two units, and inFigure 2 they are grooved as at 16 for engagement by a coneended thumbscrew 17 mounted in the edge of the platform 10. The cone end mayxexarta wedge effect on the lower side of the groove 16 to draw the partsfirmly together. Thus it is only necessary to slack off the screws 17 toenable the power unit to be lifted off the lower unit, it beingunderstood that there is a s lined or-e uivalent connection (not shownbetween t e engine crankshaft and the transmission.

In an aim-min method as team in Figure 8, the depending pins 14 areadapted to coaxial with the to engage nuts 32 which bear on the -tothpinch block extend into holes 18 provided'in pinch blocks 19 of aknownkind carried in the lower unit.

These pinch blocks 19 are mounted in reoesses'20 in the lower unit andhave thread .7 ed extensions 21 passin through vwashers 22- closing themouths of t e recesses,"and wingnuts 23 engage with the extensions 21'bearing on the washers'so that the depending lock and the side: of ahole 24 in the lower unit throu h which they extend into the pinchblocE. If preferred the depending I pins14 on the power head may haveformed in them a depression or roove 16 where the engagles so at whenthe latter is tightened up t ore is a itive engagement in addition tothe ictional, which revents disengagement until the ,pinch locks areslacked back to a sufiicient extent. I The pigs 14, however,-may'beplain as in alternative, and in many cases a prefarable connection, isshown in Figure 4. In this the end-of the pins, which are .somewhatshorter than before, are screw-threaded at .25 and are adapted to beengaged with what are in eflectjmion nuts 26-'having thumb grips27 androtatably mounted on stems 28 I pins 14 and provided at their ends withlars 29'which render the nuts 26 endwise fast when tightened up. Thisarrangement has the advantage that the nuts cannot become detached orlost.

- It will be understood that any other equivalent quick connecting.device orv devices may be emplo ed as'an alternative. Thus, as shown in1 and 6, slotted lugs30 maybe provi ed instead of the depending pins 14,and these lugs are arranged with studs 31 or set screws provided in thelower unit and engaged by wing lug and clamp it. The end of the wing nutwhich bears on the slotted lu may be cylindrical as at 33 toenter a cy'ndrlcal recess 34 in the face of the slotted lugs. This provides apositive instead of a merely frictional engagement. 7,

In the alternative construction shown by Figure 7, a split clam ingband'35 is secured e power unit an is adapted to en'ga' v the edge .of acircular platform 36'on ti: lower unit. Atthe split it is provided with'a tangentially arranged screw 37 adapted to close the band and grip theplatform 36.; Locating spring detents 38 may be employed between theband and the platform.

In Figure 8 the power unit is provided with a depending flange or a band39 toencircle a part such as the circularvplatform 36. In this case thelocking of the two units s efl'ected .by pins 40 on the part 36 engag-.mg slots inthe other part WhlOh extend first as at'41 and thencircumferentially as at teams: the crankshaft "axis in the manner -of a'ba plunger 43 carried y one part engages a recess in the other.

-- 7 As the" removal of the power portion from the lower unit wouldordinarily necessitate a disconnection of the coolin water suppl pipe,the following simple joihting means i lustrated in Figure 9 may beemployed. A collectin plate 44 for thewater is concenins-14' are.thereby gripped between the .trically ormed. or mounted on a sleeve 45carrying the casing 7 surroundingv the verticaltransmission shaft 46,the sleeve being an larly movable byv an integral wheel 47 Wit a: tiller(not shown} attached thereto for controlling the propel er to steer andreonet joint. A spring verse the boat. 'In the upper face of the 1 plate44 is a. concentric groove 48 with sides converging downwardly. .Intothis groove fits either a ring, or, as shown, a block 49 (one for eachcylinder) diametrically arran and of non-metallic substance such as eonite. I I

These blocks can be pressed into the groove by springs 55 constituted byforming radially extending spaced fingers on a ring of flat resilientmaterial 56 arranged just above the plate 44, the fingers 55 hearing onthe blocks. The latter carry pipe branches 50 connectedv at 51 to eachcylinder jacket 52, and a passage 53 in each' lock connects with itsbranch and with the bottom of the groove 48 to supply to itwatercollected by the plate. Statronar guides, which may be constitutedby the above mentioned fingers or by projections on the plate carryingthem, engage the parts 54 of the blocks to which the branches areconnected to prevent the blocks mo with the plate 44 and sleeve 45v whenthe fitter are moved angularly for steering purposes. I When the powerhead is disconnected the blocks simply lift out of the oove 48, and whenreconnected, they read- 11y re-enter the groove and are retained thereby the springs.

The invention-thus provides for the easy separation of the'two principalparts of the motor and their re-attachment with rapidity and security.

What I- claim as my invention and desire to secure by -Letters Patent ofthe United States is 1. In an outboard motor installation, thecombination of a power unit including a vertically arranged crankshaft,a crankcase enclosing said crankshaft and carrying a cylinadapted toenter and to be secured in a socket u n the other unit in alignment withsaid pm, substantially as set forth.

2. In an outboard motor installation, the combination of a power unitincluding a vertically arranged crankshaft, a crankcase enclosing saidcrankshaft and carrying a cylinder radially arrangid thereto, a secondunit separate from and low the power unit adapted to be attached to aboat, a propeller and transmission mechanism carried'by the second unit,connecting means between the two units constituted y a depending part onthe power unit adapted to engage a cooperating part on the other unit, awatercollecting plate located around the axis of the engine shaft, anannular groove in said collecting plate, and a block adapted to fit saidannular groove attached to and forming locating means for a conduitwhich supplies coolin water from the annular groove to the cylin ers,substantially as set forth.

3. In an outboard motor installation, the

' combination of a power unit including a vertically arrangedcrankshaft, a crankcase enclosing said crankshaft, and carrying acylinder radially arranggll thereto, a second unit separate from and owthe power unit the pin and anchored adapted to be attached to a boat, apropeller and transmission mechanism carried by the second unit, andconnecting means between the two units, in which the two units aresecured together by a quick fastening device comprising a pin extendingfrom one unit and screw-threaded for engagement by a threaded socketrotatably mounted endwise fast upon the other unit in alignment with thepin, substantially as set forth.

4. In an outboard motor installation, the combination of a power unitincluding a vertically arranged crankshaft, a crankcase enclosing saidcrankshaft, and carrying a cylinder radially arranged thereto, a secondunit separate from and below the power unit adapted to be attached to aboat, a propeller and transmission mechanism carried by the second unit,and connecting means between the two units, in which the fastenercomprises a screw-threaded pin extending from one unit and adapted toenter a threaded socket rotatably mounted in alignment with upon theother unit, substantially as described.

In testimony whereof I have signed my name to this specification.

EDWARD WILLIAM TROTMAN.

